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SHR Neuro Cancer Cardio Lipid

Crnkovic, S; Riederer, M; Lechleitner, M; Hallström, S; Malli, R; Graier, WF; Lindenmann, J; Popper, H; Olschewski, H; Olschewski, A; Frank, S.
Docosahexaenoic acid-induced unfolded protein response, cell cycle arrest, and apoptosis in vascular smooth muscle cells are triggered by Ca²⁺-dependent induction of oxidative stress.
Free Radic Biol Med. 2012; 52(9):1786-1795 [OPEN ACCESS]
Web of Science PubMed PUBMED Central FullText FullText_MUG


Authors Med Uni Graz:
Crnkovic Slaven
Frank Saša
Graier Wolfgang
Hallström Seth
Lechleitner Margarete
Lindenmann Jörg
Malli Roland
Olschewski Andrea
Olschewski Horst
Popper Helmuth
Riederer Monika

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Number of Figures: 8
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Proliferation of vascular smooth muscle cells is a characteristic of pathological vascular remodeling and represents a significant therapeutic challenge in several cardiovascular diseases. Docosahexaenoic acid (DHA), a member of the n-3 polyunsaturated fatty acids, was shown to inhibit proliferation of numerous cell types, implicating several different mechanisms. In this study we examined the molecular events underlying the inhibitory effects of DHA on proliferation of primary human smooth muscle cells isolated from small pulmonary artery (hPASMCs). DHA concentration-dependently inhibited hPASMC proliferation, induced G1 cell cycle arrest, and decreased cyclin D1 protein expression. DHA activated the unfolded protein response (UPR), evidenced by increased mRNA expression of HSPA5, increased phosphorylation of eukaryotic initiation factor 2α, and splicing of X-box binding protein 1. DHA altered cellular lipid composition and led to increased reactive oxygen species (ROS) production. DHA-induced ROS were dependent on both intracellular Ca(2+) release and entry of extracellular Ca(2+). Overall cellular ROS and mitochondrial ROS were decreased by RU360, a specific inhibitor of mitochondrial Ca(2+) uptake. DHA-induced mitochondrial dysfunction was evidenced by decreased mitochondrial membrane potential and decreased cellular ATP content. DHA triggered apoptosis as found by increased numbers of cleaved caspase-3- and TUNEL-positive cells. The free radical scavenger Tempol counteracted DHA-induced ROS, cell cycle arrest, induction of UPR, and apoptosis. We conclude that Ca(2+)-dependent oxidative stress is the central and initial event responsible for induction of UPR, cell cycle arrest, and apoptosis in DHA-treated hPASMCs. Copyright © 2012 Elsevier Inc. All rights reserved.
Find related publications in this database (using NLM MeSH Indexing)
Apoptosis - drug effects
Base Sequence -
Calcium - metabolism
Cell Cycle - drug effects
Cells, Cultured -
DNA Primers -
Docosahexaenoic Acids - pharmacology
Flow Cytometry -
Humans -
Membrane Potentials - drug effects
Mitochondria - drug effects
Mitochondria - physiology
Muscle, Smooth, Vascular - cytology
Muscle, Smooth, Vascular - drug effects
Muscle, Smooth, Vascular - metabolism
Oxidative Stress -
Phosphorylation -
Real-Time Polymerase Chain Reaction -
Unfolded Protein Response - drug effects

Find related publications in this database (Keywords)
Oxidative stress
Unfolded protein response
n-3 polyunsaturated fatty acid
Cell cycle
Free radicals
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